ProMax® Atmospheric Vent Spec Sheet

For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
www.hotwater.com | 800-527-1953 Toll-Free USA
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AOSRG47000
FLAMMABLE VAPOR IGNITION RESISTANT (FVIR) WATER HEATERS
A. O. Smith FVIR design meets the American National Standards Institute standards
(ANSIZ21.10.1-CSA 4.1) that deal with the accidental or unintended ignition of flammable
vapors, such as those emitted by gasoline.
Features a sealed combustion chamber with intake air filter and a flame arrestor built into the
water heater base. In addition, a thermal cutoff (TCO) device, is designed to shut off gas flow
to the burner and pilot if poor combustion is detected.
Residential Gas
Water Heaters
Maximum Hydrostatic Working Pressure: 150 PSI
B
A
G
H
F
D
1/2" GAS
CONNECTION
COLD
CONNECTION
C
E
HOT
CONNECTION
(ANODE OUTLET
ON T&P MODELS)
ANODE ROD
(OPTIONAL T&P
LOCATION)
T&P VALVE
Recovery capacities based on actual performance tests.
Water connection is 3/4” on all models
†Models ship with supplied insulation blanket.
For 10-year tank and 6-year parts warranty, change “G” to “X” in model number (example: XCR-30).
‡ LP models not available on GCRH-40.
*For optional side-mounted recirculating taps, add “L” to the suffix (example: GCR-40L).
All models approved for installation from sea level to 10,100 ft. elevation.
Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.
Model Number
Gallon
Capacity
First
Hour
Rating
Gallon
Energy
Factor
BTU Input
Natural
Gas
BTU Input
Propane
Gas
Recovery
90°F Rise
Gallon Per
Hour
Dimensions in Inches
Approx.
Shipping
Weight (lbs)
A B C D E F *G *H
Draft
Hood
Tall Models
†GCB-30 30 64 0.63 35,500 32,000 37 61-1/2 58 16 12-1/4 8 51-3/4 N/A N/A 3 or 4 123
GCR-30 30 67 0.63 35,500 32,000 37 61-1/2 58 18 12-1/4 8 51-3/4 N/A N/A 3 or 4 132
‡GCRH-40 40 67 0.62 35,500 N/A 38 61-3/4 58-1/4 20 12-1/4 8 52 N/A N/A 3 or 4 138
†GCB-40 40 70 0.62 40,000 36,000 42 61-3/4 58-1/4 18 12-1/4 8 52 N/A N/A 3 or 4 130
GCR-40* 40 70 0.62 40,000 36,000 42 61-3/4 58-1/4 20 12-1/4 8 52 14-1/4 51-3/4 3 or 4 138
GCG-50* 50 88 0.60 40,000 37,000 41 60-3/4 57-1/4 21 12-1/4 8 50 1/2 14-1/4 50-1/2 3 or 4 148
GCR-50* 50 88 0.62 40,000 37,000 43 60-3/4 57-1/4 22 12-1/4 8 50-1/2 14-1/4 50-1/2 3 or 4 165
GCRT-50* 50 92 0.60 50,000 45,000 54 60-3/4 57-1/4 22 12-1/4 8 50-1/2 14-1/4 50-1/2 4 165
†GCRX-50* 50 98 0.60 60,000 54,000 65 65-1/2 61 22 13-1/2 8 54-1/4 14-1/4 50-1/4 4 190
Short Models
†GCBL-30 30 56 0.63 35,500 32,000 37 50 46-1/2 18 12 8 40 N/A N/A 3 or 4 110
GCRL-30 30 62 0.63 35,500 32,000 37 50 46-1/2 20 12 8 40 N/A N/A 3 or 4 118
†GCBL-40 40 67 0.62 40,000 36,000 41 51-1/2 48 20 12 8 41-1/4 N/A N/A 3 or 4 134
GCRL-40 40 68 0.62 40,000 36,000 41 51-1/2 48 22 12 8 41-1/4 N/A N/A 3 or 4 135
GCRL-50 50 93 0.60 40,000 40,000 43 53-1/4 49-3/4 24 12 8 41-3/8 N/A N/A 3 or 4 177